reth_evm::revm::primitives::alloy_primitives

Trait FixedBytesSliceExt

pub trait FixedBytesSliceExt {
    // Required methods
    fn as_flattened(&self) -> &[u8] ⓘ;
    fn as_flattened_mut(&mut self) -> &mut [u8] ⓘ;
}

Expand description

Extension trait for flattening a slice of FixedBytes to a byte slice.

This mirrors the standard library’s as_flattened and as_flattened_mut methods for &[[T; N]].

Required Methods§

fn as_flattened(&self) -> &[u8] ⓘ

Takes a &[FixedBytes<N>] and flattens it to a &[u8].

§Panics

This panics if the length of the resulting slice would overflow a usize.

This is only possible when N == 0, which tends to be irrelevant in practice.

§Examples

use alloy_primitives::{FixedBytes, FixedBytesSliceExt};

let arr = [FixedBytes::<4>::new([1, 2, 3, 4]), FixedBytes::new([5, 6, 7, 8])];
assert_eq!(arr.as_flattened(), &[1, 2, 3, 4, 5, 6, 7, 8]);

fn as_flattened_mut(&mut self) -> &mut [u8] ⓘ

Takes a &mut [FixedBytes<N>] and flattens it to a &mut [u8].

§Panics

This panics if the length of the resulting slice would overflow a usize.

This is only possible when N == 0, which tends to be irrelevant in practice.

§Examples

use alloy_primitives::{FixedBytes, FixedBytesSliceExt};

fn add_one(slice: &mut [u8]) {
    for b in slice {
        *b = b.wrapping_add(1);
    }
}

let mut arr = [FixedBytes::<4>::new([1, 2, 3, 4]), FixedBytes::new([5, 6, 7, 8])];
add_one(arr.as_flattened_mut());
assert_eq!(arr[0].as_slice(), &[2, 3, 4, 5]);